Set postdata after get_post to set their data.
$id=12;
$post = get_post($id);
setup_postdata($post);
$content = apply_filters('the_content', $post->post_content);
echo $content;
wp_reset_postdata();
Set postdata after get_post to set their data.
$id=12;
$post = get_post($id);
setup_postdata($post);
$content = apply_filters('the_content', $post->post_content);
echo $content;
wp_reset_postdata();